Possible Duplicate:
Check if a variable is empty
Simple PHP question:
I have this stement:
if (isset($_POST["password"]) && ($_POST["password"]=="$password")) {
...//IF PASSWORD IS CORRECT STUFF WILL HAPPEN HERE
}
Somewhere above this statement I use the following line in my JavaScript to set the username as a variable both in my JavaScript and in my PHP:
uservariable = <?php $user = $_POST['user']; print ("\"" . $user . "\"")?>;
What I want to do is add a condition to make sure $user is not null or an empty string (it doesn't have to be any particular value, I just don't want it to be empty. What is the proper way to do this?
I know this is a sill question but I have no experience with PHP. Please advise, Thank you!
This question is related to
php
variables
null
conditional-statements
Null OR an empty string?
if (!empty($user)) {}
Use empty().
After realizing that $user ~= $_POST['user'] (thanks matt):
var uservariable='<?php
echo ((array_key_exists('user',$_POST)) || (!empty($_POST['user']))) ? $_POST['user'] : 'Empty Username Input';
?>';
Use empty(). It checks for both empty strings and null.
if (!empty($_POST['user'])) {
// do stuff
}
From the manual:
The following things are considered to be empty:
"" (an empty string)
0 (0 as an integer)
0.0 (0 as a float)
"0" (0 as a string)
NULL
FALSE
array() (an empty array)
var $var; (a variable declared, but without a value in a class)
Source: Stackoverflow.com